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Preparing method of dendritic silver powder

A technology of dendritic and silver powder, applied in the field of preparation of dendritic silver powder, can solve the problems of difficulty in mass production, high heating temperature, poor repeatability, etc., and achieve the effects of reducing processing cost, high stability and shortening production cycle

Active Publication Date: 2020-03-31
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN101811196A reports a method for preparing dendritic micron silver powder by liquid-phase chemical synthesis. In this method, the oxidizing agent is quickly added to the reducing agent to prepare dendritic micron silver powder. The repeatability of the pouring method is poor, and the controllability and stability of silver powder preparation cannot be guaranteed. , it is difficult to achieve industrial mass production
The heating temperature of this method is higher than 100°C, which requires high energy consumption and is not conducive to mass production; in addition, a large amount of acetone needs to be added in the post-treatment of silver powder, which is harmful to human body and environment.

Method used

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  • Preparing method of dendritic silver powder
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  • Preparing method of dendritic silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Dissolve 170 g of silver nitrate crystals in 1 L of deionized water, add 0.85 g of NaOH, mix and stir evenly, and control the temperature of the solution to 35°C.

[0029] 2. Dissolve 175 g of ascorbic acid in 0.8 L of deionized water, add 2 g of oleic acid, mix and stir evenly, and control the temperature of the solution to 35°C.

[0030] 3. Use a peristaltic pump to add the silver nitrate solution dropwise into the ascorbic acid solution. The stirring speed of the ascorbic acid solution is 400 rpm, and the silver nitrate solution drop rate is 0.2 L / min. After the silver nitrate solution is added dropwise, stop stirring and let stand for 1 min until the solution is clear.

[0031] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is dried in a blast oven at 90°C for 12 hours.

[0032] analyzed by scanning electron microscopy, as figure 1 As shown, the morphology of the prepared silver powder is de...

Embodiment 2

[0034] 1. Dissolve 3.675 kg of silver nitrate crystals in 31 L of deionized water, add 70 g of NaOH, mix and stir evenly, and control the temperature of the solution to 35°C.

[0035] 2. Dissolve 3.675 kg of ascorbic acid in 52 L of deionized water, add 37 g of oleic acid, mix and stir evenly, and control the temperature of the solution to 35°C.

[0036] 3. Use a peristaltic pump to drop the silver nitrate solution into the ascorbic acid solution. The stirring speed of the ascorbic acid solution is 350 rpm, and the silver nitrate solution dropping speed is 2 L / min. After the silver nitrate solution is added dropwise, stop stirring and let it stand for 1 min until the solution is clear.

[0037] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is dried in a blast oven at 90°C for 12 hours.

[0038] analyzed by scanning electron microscopy, as figure 2 As shown, the morphology of the prepared silver powder i...

Embodiment 3

[0040] 1. Dissolve 1 kg of silver nitrate crystals in 10 L of deionized water, add 15 g of NaOH, mix well, and control the temperature of the solution to 45°C.

[0041] 2. Dissolve 2 kg of glucose in 10 L of deionized water, add 20 g of oleic acid, mix well, and control the temperature of the solution to 45°C.

[0042] 3. Use a peristaltic pump to drop the silver nitrate solution into the ascorbic acid solution. The stirring speed of the ascorbic acid solution is 550 rpm, and the silver nitrate solution dropping speed is 5 L / min. After the silver nitrate solution is added dropwise, stop stirring and let stand for 1 min until the solution is clear.

[0043] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is dried in a blast oven at 90°C for 12 hours.

[0044] analyzed by scanning electron microscopy, as image 3 As shown, the morphology of the prepared silver powder is dendritic.

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Abstract

The invention discloses a preparing method of dendritic silver powder. The method includes the steps of dissolving silver nitrate crystals in deionized water to prepare a silver nitrate solution, dissolving ascorbic acid or glucose in deionized water to prepare a reducing agent solution, dropwise adding the silver nitrate solution to the reducing agent solution for chemical reduction reaction, stopping stirring when the silver nitrate solution is all dropwise added, performing solid-liquid separating on silver powder through suction filtration, and then performing drying to obtain the dendritic silver powder. No polymeric dispersants are added to the silver powder prepared through the method, washing and collecting are simple, waste liquid disposal cost is low, and the silver powder is friendly to the environment and suitable for industrial batch production; and by adjusting the content of a nucleation control agent to control the morphology of the silver powder, the prepared silver powder is dendritic silver powder with the trunk average length of 5-15 [mu]m and the single-branch average length of 0.5-3 [mu]m.

Description

technical field [0001] The invention belongs to the field of new material preparation, and relates to a preparation method of metallic silver powder, in particular to a preparation method of dendritic silver powder. Background technique [0002] Conductive paste is the core material of the electronics industry and can be widely used in technical fields such as membrane switches, printed circuits, radio frequency tags, and electronic paper electrode materials. Silver powder is the key material for the composition of conductive paste. Three-dimensional dendritic silver powder has a unique three-dimensional skeleton structure. Compared with spherical silver powder and flake silver powder, under the same quality conditions, the prepared conductive silver paste is easier to form seepage network and anisotropic conductivity. . At present, liquid-phase chemical synthesis is the main method for preparing silver powder, which has the advantages of low cost and easy mass production. ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
CPCB22F1/0007B22F9/24
Inventor 朱佩佩袁松王灿魏冰歆陈大鹏
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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